masto-

1. a combining form meaning “breast,” used in the formation of compound words.

   mastopathy.

masto-

combining form

1. indicating the breast, mammary glands, or something resembling a breast or nipple

   mastodon

   mastoid

Word History and Origins

Origin of masto-¹

Combining form representing Greek mastós breast

Word History and Origins

Origin of masto-¹

from Greek mastos breast

Example Sentences

Regrettably, this group does not include Nevada Democratic Sen. Catherine Cortez Masto, who announced in March 2024 that she would oppose Mangi in light of his ties to “an organization that I have found has connections to individuals who killed police officers.”

From Slate

There may have been other Democrats who would have refused to back Mangi, but they never had to say so in public: Thanks to the credulousness and/or cowardice of Cortez Masto and Rosen, Republicans secured the two defections they needed.

From Slate

But Cortez Masto and Rosen are still in the Senate, and both voted to reject Bove.

From Slate

So in light of his confirmation, I reached out to Cortez Masto’s office to ask if she now regrets withholding her support from Mangi.

From Slate

A spokesperson provided me with the following statement: “Senator Cortez Masto made her opposition to Adeel Mangi clear in March of 2024 due to his anti-law enforcement record and opposition from key law enforcement groups, giving the Biden Administration plenty of time to find a solution. She does not support Emil Bove’s confirmation to the seat.”

From Slate

When To Use

What does masto- mean?

Masto- is a combining form used like a prefix meaning “breast.” It is often used in medical terms, especially in anatomy and pathology.Masto- comes from the Greek mastós, meaning “breast.” The Latin-based analog to masto- is mammo-, from mamma, meaning “breast.”What are variants of masto-?When combined with words or word elements that begin with a vowel, masto- becomes mast-, as in mastectomy.